9.2 KiB
README for libpng version 1.6.37 - April 14, 2019
See the note about version numbers near the top of png.h. See INSTALL for instructions on how to install libpng.
Libpng comes in several distribution formats. Get libpng-.tar.gz or libpng-.tar.xz or if you want UNIX-style line endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style line endings.
Version 0.89 was the first official release of libpng. Don't let the fact that it's the first release fool you. The libpng library has been in extensive use and testing since mid-1995. By late 1997 it had finally gotten to the stage where there hadn't been significant changes to the API in some time, and people have a bad feeling about libraries with versions < 1.0. Version 1.0.0 was released in March 1998.
Note that some of the changes to the png_info structure render this version of the library binary incompatible with libpng-0.89 or earlier versions if you are using a shared library. The type of the "filler" parameter for png_set_filler() has changed from png_byte to png_uint_32, which will affect shared-library applications that use this function.
To avoid problems with changes to the internals of the png info_struct, new APIs have been made available in 0.95 to avoid direct application access to info_ptr. These functions are the png_set_ and png_get_ functions. These functions should be used when accessing/storing the info_struct data, rather than manipulating it directly, to avoid such problems in the future.
It is important to note that the APIs did not make current programs that access the info struct directly incompatible with the new library, through libpng-1.2.x. In libpng-1.4.x, which was meant to be a transitional release, members of the png_struct and the info_struct can still be accessed, but the compiler will issue a warning about deprecated usage. Since libpng-1.5.0, direct access to these structs is not allowed, and the definitions of the structs reside in private pngstruct.h and pnginfo.h header files that are not accessible to applications. It is strongly suggested that new programs use the new APIs (as shown in example.c and pngtest.c), and older programs be converted to the new format, to facilitate upgrades in the future.
Additions since 0.90 include the ability to compile libpng as a Windows DLL, and new APIs for accessing data in the info struct. Experimental functions include the ability to set weighting and cost factors for row filter selection, direct reads of integers from buffers on big-endian processors that support misaligned data access, faster methods of doing alpha composition, and more accurate 16->8 bit color conversion.
The additions since 0.89 include the ability to read from a PNG stream which has had some (or all) of the signature bytes read by the calling application. This also allows the reading of embedded PNG streams that do not have the PNG file signature. As well, it is now possible to set the library action on the detection of chunk CRC errors. It is possible to set different actions based on whether the CRC error occurred in a critical or an ancillary chunk.
For a detailed description on using libpng, read libpng-manual.txt. For examples of libpng in a program, see example.c and pngtest.c. For usage information and restrictions (what little they are) on libpng, see png.h. For a description on using zlib (the compression library used by libpng) and zlib's restrictions, see zlib.h
I have included a general makefile, as well as several machine and compiler specific ones, but you may have to modify one for your own needs.
You should use zlib 1.0.4 or later to run this, but it MAY work with versions as old as zlib 0.95. Even so, there are bugs in older zlib versions which can cause the output of invalid compression streams for some images.
You should also note that zlib is a compression library that is useful for more things than just PNG files. You can use zlib as a drop-in replacement for fread() and fwrite(), if you are so inclined.
zlib should be available at the same place that libpng is, or at https://zlib.net.
You may also want a copy of the PNG specification. It is available as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find these at http://www.libpng.org/pub/png/pngdocs.html .
This code is currently being archived at libpng.sourceforge.io in the [DOWNLOAD] area, and at http://libpng.download/src .
This release, based in a large way on Glenn's, Guy's and Andreas' earlier work, was created and will be supported by myself and the PNG development group.
Send comments/corrections/commendations to png-mng-implement at lists.sourceforge.net (subscription required; visit https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe).
Send general questions about the PNG specification to png-mng-misc at lists.sourceforge.net (subscription required; visit https://lists.sourceforge.net/lists/listinfo/png-mng-misc to subscribe).
Files in this distribution:
ANNOUNCE => Announcement of this version, with recent changes
AUTHORS => List of contributing authors
CHANGES => Description of changes between libpng versions
KNOWNBUG => List of known bugs and deficiencies
LICENSE => License to use and redistribute libpng
README => This file
TODO => Things not implemented in the current library
TRADEMARK => Trademark information
example.c => Example code for using libpng functions
libpng.3 => manual page for libpng (includes libpng-manual.txt)
libpng-manual.txt => Description of libpng and its functions
libpngpf.3 => manual page for libpng's private functions
png.5 => manual page for the PNG format
png.c => Basic interface functions common to library
png.h => Library function and interface declarations (public)
pngpriv.h => Library function and interface declarations (private)
pngconf.h => System specific library configuration (public)
pngstruct.h => png_struct declaration (private)
pnginfo.h => png_info struct declaration (private)
pngdebug.h => debugging macros (private)
pngerror.c => Error/warning message I/O functions
pngget.c => Functions for retrieving info from struct
pngmem.c => Memory handling functions
pngbar.png => PNG logo, 88x31
pngnow.png => PNG logo, 98x31
pngpread.c => Progressive reading functions
pngread.c => Read data/helper high-level functions
pngrio.c => Lowest-level data read I/O functions
pngrtran.c => Read data transformation functions
pngrutil.c => Read data utility functions
pngset.c => Functions for storing data into the info_struct
pngtest.c => Library test program
pngtest.png => Library test sample image
pngtrans.c => Common data transformation functions
pngwio.c => Lowest-level write I/O functions
pngwrite.c => High-level write functions
pngwtran.c => Write data transformations
pngwutil.c => Write utility functions
arm => Contains optimized code for the ARM platform
powerpc => Contains optimized code for the PowerPC platform
contrib => Contributions
arm-neon => Optimized code for ARM-NEON platform
powerpc-vsx => Optimized code for POWERPC-VSX platform
examples => Example programs
gregbook => source code for PNG reading and writing, from
Greg Roelofs' "PNG: The Definitive Guide",
O'Reilly, 1999
libtests => Test programs
mips-msa => Optimized code for MIPS-MSA platform
pngminim => Minimal decoder, encoder, and progressive decoder
programs demonstrating use of pngusr.dfa
pngminus => Simple pnm2png and png2pnm programs
pngsuite => Test images
testpngs
tools => Various tools
visupng => Contains a MSVC workspace for VisualPng
intel => Optimized code for INTEL-SSE2 platform
mips => Optimized code for MIPS platform
projects => Contains project files and workspaces for
building a DLL
owatcom => Contains a WATCOM project for building libpng
visualc71 => Contains a Microsoft Visual C++ (MSVC)
workspace for building libpng and zlib
vstudio => Contains a Microsoft Visual C++ (MSVC)
workspace for building libpng and zlib
scripts => Directory containing scripts for building libpng:
(see scripts/README.txt for the list of scripts)
Good luck, and happy coding!
- Cosmin Truta (current maintainer, since 2018)
- Glenn Randers-Pehrson (former maintainer, 1998-2018)
- Andreas Eric Dilger (former maintainer, 1996-1997)
- Guy Eric Schalnat (original author and former maintainer, 1995-1996) (formerly of Group 42, Inc.)